Diphenylmethane derivatives

ABSTRACT

Diphenylmethane derivatives represented by the formula,   WHEREIN R1 is -OR, -COOR or -CH2OR, in which R is propargyl or allyl; R2 and R3 are hydrogen a halogen, an alkyl or methylenedioxy bonded to two carbon atoms adjacent to each other on the benzene ring; when R is propargyl R4 is hydrogen, an alkyl, -OR&#39;&#39;, -COOR&#39;&#39;, -CH2OR&#39;&#39; or   IN WHICH R&#39;&#39; is propargyl, allyl or an alkyl and R&#39;&#39;&#39;&#39; is an alkyl or a halogen, when R is allyl R4 is -OR&#39;&#39;&#39;&#39;&#39;&#39;, -COOR&#39;&#39;&#39;&#39;&#39;&#39; or CH2OR&#39;&#39;&#39;&#39;&#39;&#39; in which R&#39;&#39;&#39;&#39;&#39;&#39; is allyl or an alkyl; m and n are an integer of 1 to 5 and when m and/or n are an integer of 2 or more, R2&#39;&#39;s and/or R3&#39;&#39;s may be the same or different; the diphenylmethane derivatives being employable as synergists for insecticides.

United States Patent 1191 Kitamura et al.

[ Nov. 5, 1974 1 1 DIPHENYLMETHANE DERIVATIVES [75] Inventors: Shigeyoshi Kitamura, Toyonaka;

Hajime Hirai, Minoo; Yositosi Okuno, Toyonaka; Keimei Fujimoto, Kobe, all of Japan [73] Assignee: Sumitomo Chemical Company, Ltd.,

Osaka, Japan 22 Filed: June 15, 1972 21 Appl. No.: 263,243

Related US. Application Data [62] Division of Ser. No. 20,058, March 16, 1970, Pat.

[30] Foreign Application Priority Data OTHER PUBLICATIONS March et al., Jour. Econ. EntomoL; (1952), pages 851-852. 1

Primary Examiner-Bernard Helfin Attorney, Agent, or Firm-Stevens, Davis, Miller & Mosher [57] ABSTRACT Diphenylmethane derivatives represented by the formula,

3)n \C/ wherein R is OR, COOR or CH OR, in which R is propargyl or allyl; R and R are hydrogen a halogen, an alkyl or methylenedioxy bonded to two carbon atoms adjacent to each other on the benzene ring; when R is propargyl R is hydrogen, an alkyl, OR', COOR, CH OR' or in which R' is propargyl, allyl or an alkyl and R" is an alkyl or a halogen, when R is allyl R is OR'.", COOR' or C1-l OR' in which R' is allyl or an alkyl; m and n are an integer of 1 to 5 and when m and/or n are an integer of 2 or more, R s and/or R s may be the same or different; the diphenylmethane derivatives being employable as synergists for insecticides.

5 Claims, No Drawings DIPHENYLMETHANE DERIVATIVES This is a division of application Ser. No. 20,058, filed Mar. 16, 1970 and now US. Pat. No. 3,702,864.

This invention relates to a method for producing a novel diphenylmethane derivative represented by the following formula (I), and to a composition comprising said diphenylmethane derivative as an effective ingreclient:

wherein R is OR, -COOR or CH OR, in which R is propargyl or allyl; R and R are hydrogen, a halogen, an alkyl or methylenedioxy bonded to two carbon atoms adjacent to each other on the benzene ring; when R is propargyl R is hydrogen, an alkyl, OR,

in which R is propargyl, allyl or an alkyl and R" is an alkyl or a halogen, when R is allyl R is OR', COOR' or CH OR' in which R is allyl or an alkyl; m and n are an integer of l to 5 and when m and- /or n are an integer of 2 or more, R s and/or R s may be the same or different.

In the present invention, the term alkyl and alkoxy mean a straight chainor branched chainalkyl and alkoxy having one to four carbon atoms.

The compounds of the present invention show only weak insecticidal activity when used alone, nevertheless they can markedly enhance the effectiveness of other insecticides such as cyclopropanecarboxylate and carbamates, or mixtures of two or more of these insecticides, when said compounds are added thereto in an amount of 0.5 to 50times the weight of said insecticides.1 Moreover, the present compounds are 'relatively inexpensive and low in toxicity to mammals so that they can be advantageously used also to increase the safeness of insecticides.

The most advantageous amount of the present compounds to be added is determined by the purpose of the addition and by the kind of insecticide, because said amount depends upon the degree of desired reinforcement of insecticidal activity and the relative cost of the present compound to that of given insecticide.

The diphenylmethane derivatives having the general formula I) are novel compounds which have been first synthesized by the present inventors. According to the present invention, these compounds may be readily produced in high yields at low costs by reacting a compound having the formula,

wherein R R;,, m and n are as defined-above, R is hydrogen, an alkyl, hydroxyl, carboxyl, hydroxymethyl, OR, COOR, CH OR' or in which R and R" are as defined above, and Y is hydroxyl, carboxyl, hydroxymethyl, a halogen, an alkoxycarbonyl or an acyl halide, with a compound having the formula,

R (Ill) be preferably employed, and the reaction may be preferably conducted in a solvent.

The second embodiment of the process is to obtain the diphenylmethane (I) by reacting the compound having carboxylas Y or as Y and R in the formula (II), with the halide having the formula, R Hal wherein R is as defined above and Hal is a halogen.

This reaction may be preferably conducted in an inert solvent in the presence of basic condensing agents such as organic tertiary bases, hydroxides or carbonates of an alkali metal or an alkaline earth metal. In case where the organic tertiary base is employed as the condensing agent, said base may be reacted with said compound (II), or said halide in advance, but it is preferable to react the three reactants simultaneously.

In case where the hydroxides or carbonates are employed as the condensing agent, it is preferable to react said hydroxides or carbonate with the compound (II) in advance.

The third embodiment of the process is to obtain the diphenylmethane (I) by reacting the compound having an acylhalide as Y in the formula (II), with the alcohol having the formula, R OH wherein R, is as defined above.

This reaction may be preferably conducted in a solvent in the presence of a dehydrogenhalide agent such as organic tertiary base and carbonates of an alkali metal or an alkaline earth metal at relatively low temperature. i

The fourth embodiment of the process is to obtain. the diphenylmethane (I) by reacting acid anhydrides of the compound (II) with the alcohol having the formula, R, OH wherein R, is as defined above.

This reaction may be preferably conducted in an inert solvent under heating.

The fifth embodiment of the process is to obtain the diphenylmethane (I) by reacting the compound having alkoxycarbonyl as Y or as Y and R in the formula (II), with alcohol having the formula, R OH wherein R is as defined above.

This reaction may be preferably conducted in the presence of a catalyst for esterification and in the presence of a sodium alcoholate.

The sixth embodiment of the process is to obtain'the diphenylmethane (I) by reacting an alkali metal salt of the compound having hydroxyl or hydroxymethyl as Y or as Y and R in the formula (II), with the halide having the formula, R Hal wherein R and Hal are as defined above, or vice versa.

This reaction may be preferably conducted in an inert solvent at room temperature or higher.

The seventh embodiment of the process is to obtain the diphenylmethane (I) by reacting the compound having hydroxyl or hydroxylmethyl, as Y or as Y and R in the formula (II), with the alcohol having the formula, R OH wherein R is as defined above.

This reaction may be preferably conducted in the presence of a catalyst such as sulfuric acid and p-toluenesulfonic acid.

In the compounds having the formula (II), some compounds having the formula (IV) are novel compounds,

- R1 ah C CORE wherein R is hydroxyl, a halogen, an alkyloxy or allyloxy, R is propargyloxy when R, is hydroxyl or a hal-' ogen, or R is a halogen when R, is an alkyloxy or allyloxy, and R R m and n are as defined above.

The compounds having the formula (IV).rnay be easily prepared in high yield according to the following procedures.

The compounds having propargyloxy as R in the above-mentioned formula (IV) may be prepared by rewherein R is hydroxyl or a halogen and R R m and n are as defined above, or acid halides thereof with propargyl alcohol or a propargyl halide, if desired in the presence of a basic condensing agent or a dehydrogen halide agent, or reacting a compound having the formula (VI),

COOCIIQCECII I V (VI) wherein R R m and n are as defined above, with a halogenating agent such as phosphorus tribromide,

The compounds having a'halogen as R in the abovementioned formula (IV) may be prepared by reacting a compound having the formula (VII),

(VII) wherein R is an alkyloxy or allyloxy and R R m and n are as defined above, with a halogenating agent according to the conventional procedure.

The diphenylmethane derivatives having the general formula (I), are new compounds. The biological test showed that these new compounds have a powerful synergetic action to insecticides of chrysanthemic ester type and carbamate type, far stronger than that of piatoms and methylenedioxy bonded to two carbon atoms adjacent to each other on the benzene ring.

l-Alkyloxy, l-allyloxy and l-propargyloxy derivatives of .1,l-diphenyl-2propargyloxy-ethane, and their derivatives which phenyl groups bear at least one substituent selected from the group consisting of alkyls, halogen atoms and methylenedioxy bonded to two carbon atoms adjacent to each other on the benzene ring.

3-Alkyloxy, 3-allyloxy "and 3-propargyloxy derivatives of 2,2-diphenyl-l-propargyloxy-propane, and their derivatives which phenyl groups bear atleast one substituent selected from .the group consisting of alkyls, halogen atoms and methylenedioxy bonded to two car'- bon atoms adjacent to each other on the benzene ring.

a-alkyloxy, a-allyloxy and a-propargyloxy derivatives of propargyl diphenylacetate, and their derivatives which phenyl groups bear at least one substituent selected from the group consisting-of alkyls, halogen atoms and methylenedioxy bonded to two carbon atoms adjacent to each other on the benzene ring.

B-Alkyloxy, fl-allyloxy and B-propargyloxy derivatives of propargyl a,a-diphenyl-propionate, and their derivatives which phenyl groups hear at least one substituent selected from the group consisting of alkyls, halogen atoms and methylenedioxy bonded to two carbon atoms adjacent to each other on the benzene ring.

Dipropargyl, propargylalkyl and propargylallyl esters of diphenylmalonic acid, and their derivatives which phenyl groups bear at least one substituent selected from the group consisting of alkyls, halogen atoms and methylenedioxy bonded to two carbon atoms adjacent to each other on the benzene ring.

l-Alkyl derivatives of 1 ,l-diphenyll proparbyloxymethane and their derivatives which phenyl groups bear at least one substituent selected from the group consisting of alkyls, halogen atoms and methylenedioxy bonded to two carbon atoms adjacent to each other on the benzene ring.

a-Alkyloxy, a-allyloxy and a-propargyloxy derivatives of allyl diphenylacetate, and their derivatives which phenyl groups bear at least one substituent selected from the group consisting of alkyls, halogen atoms and methylenedioxy bonded to two carbon atoms adjacent to each other on the benzene ring.

fi-Alkyloxy, B-allyloxy and B-propargyloxy derivatives of allyl a,a-diphenyl-propionate, and their derivatives which phenyl groups bear at least one substituent selected from the group consisting of alkyls, halogen atoms and methylenedioxy bonded to two carbon atoms adjacent to eachother on the benzene ring.

2,2-Diphenyl-l-propargyloxy-ethane, and their 2- alkyl derivatives, and their derivatives which phenyl groups bear at least one substituent selected from the group consisting of alkyls, halogen atoms and methylenedioxy bonded to two carbon atoms adjacent to each other on the benzene ring. Propargyl diphenylacetate and their a-alkyl and a-phenyl derivatives, and their derivatives which phenyl groups bear at least one substituent selected from the group consisting of alkyls, halogen atoms and methylenedioxy bonded to two carbon atoms adjacent to each other on the benzene ring.

Alkyloxy and allyloxy derivatives of diphenylallyloxymethane, and their derivatives which phenyl groups bear at least one substituent selected from the group consisting of alkyls, halogen atoms and methylenedioxy bonded to two carbon atoms adjacent to each other on the benzene ring.

2-Alkyloxy and 2-allyloxy derivatives of 2,2- diphenyl-l-allyloxyethane, and their derivatives which phenyl groups bear at least one substituent selected from the group consisting of alkyls, halogen atoms and methylenedioxy bonded to two carbon atoms adjacent to each other on the benzene ring.

3-Alkyloxy and 3-allyloxy derivatives of 2,2- diphenyl-l-allyloxypropane, and their derivatives which phenyl groups bear at least one substituent selected from the group consisting of alkyls, halogen atoms and methylenedioxy bonded to two carbon atoms adjacent to each other on the benzene ring.

az-Allyloxy and a-propargyloxy derivatives of allyl diphenylacetate, and their derivatives which phenyl groups bear at least one substituent selected from the group consisting of alkyls, halogen atoms and methylenedioxy bonded to two carbon atoms adjacent to each other on the benzene ring.

B-Allyloxy and B-propargyloxy derivatives of alkyl a,a-diphenylacetate, and their derivatives which phenyl groups hear at least one substituent selected from the group consisting of alkyls, halogen atoms and methylenedioxy bonded to two carbon atoms adjacent to each other on the benzene ring.

Allylalkyl and diallyl esters of diphenylmalonic acid, and their esters which phenyl groups hear at least one substituent selected from the group consisting of alkyls, halogen atoms and methylenedioxy bonded to two carbon atoms adjacent to each other on the benzene ring.

The chemical structures and physical properties of the typical compounds of the present invention are given below to illustrate, but not to limit, the invention.

No.. of compounds 1. Propargyl a-phenyl-a-propargyIoxy-phenylacetate OCHICE CH 2. Methyl a-phenyl-a-propargyloxy-phenylacetate Q ocrnczorr 4. Propargyl a-p-tolyl-phenylacetate C UB 1. 5641 mC-Q o o OCI-hOEOH 5. i ,1-Diphenyl-l-propargyloxy-pentane Q omcmomcm Q ocmozorr 6. Diphenylmethyl propargyl ether 4 OCHzCEGH 7. 2,2-Diphenyl- 1 -propargyloxy-ethane 8. 1,1-Diphenyl-l ,2-dipropargyloxy-ethane Q OCHQCECH C m.p. 48.5 4. 95

Q cmoomozon 9. Propargyl propionate Q cmoom 05011 10. Propargyl a-phenyl-a-methoxy-phenylacetate OCH; oooomozolr 11. Proparg'yl diphenylmalonate C OOCH1 CECII oooomczon a,a-diphenyl-[i-propargyloxyl2. 2,2-Diphenyl-l ,3-dipropargyloxy-propane 13. Allyl a-phenyl-a-methoxy-phenylacetate 14. 2,2-Diphenyl-2-methoxyl -propargyloxy-ethane Q/ CHiOCHzCHECH 15. 2,2-Diphenyl-2-methoxyl -allyloxy-ethane /O CH:

C\ no 1.5671 Q cm 0 cmc 0:011:

The method for producing the present compounds is further illustrated in the following examples which are,

0 of course, not intended to limit the present invention.

EXAMPLE 1 A solution of 4.6 g of benzilic acid in 10 cc of anhydrous dimethylformamide was added, at room temperature with stirring, to 720 mg of sodium hydrideparaffm (68 percent) admixed with 20 cc of anhydrous dimethylformamide. After one hour, 5 g of propargyl bromide was added to the mixture at 10C, and then substance having a refractive index of n 1.566 after being purified by alumina column. chromatography.

Elementary analysis:

Calculated for c,,i-i,,0, 78.95 5.26

Found 79.06 5.22

EXAMPLE 2 A solution of 2.7 g of propargyl ester of a-phenyl-a-hydroxyphenylacetic acid in cc of anhydrous dimethylformamide was added to 360 mg of sodium hydride-paraffin (68 percent) admixed with cc of anhydrous dimethylformamide. The resultant mixture was reacted with 1.2 g of propargyl bromide in a manner similar to that in Example 1 to give 1.9 g of propargyl ester of a-phenyl-a-propargyloxyphenylacetic acid, an oily substance having a refractive index of u 1.5663 after being purified by alumina column chromatography.

Elementary analysis:

C H Calculated for C H O 78.95 5.26 Found 78.88 5.13

EXAMPLE 3 2.5 g of propargyl bromide was added to a solution of 5.3 g of a-phenyl-a-propargyloxyphenylacetic acid and 2.5 g of triethylamine in 30 cc of dimethylformamide, and the resultant mixture was heated at 60C with stirring for 1 hour. After cooling, the reaction mixture was poured into water, followed by extraction with ether. The ether solution was dried over anhydrous magnesium sulfate, and the ether was removed by distillation to give 6.5 g of propargyl ester of a-phenyl-apropargyloxyphenylacetic acid, an oily substance having a refractive index of n 1.5671 after being purified byalumina column chromatography.

Elementary analysis:

c H Calculated for c n o 78.95 5.26 Found 78.97 5.20

EXAMPLE 4 A solution of 2.4 g of methyl a-phenyl-a-hydroxyphenylacetate in 10 cc of anhydrous dimethylformamide was added to 360 mg of sodium hydride-paraffin (68' percent) admixed with 20 cc of anhydrous dimethylformamide. The resultant mixture was reacted with 1.5 g of propargyl bromide in a manner similar to that inExample l to give 2.0 g of methyl ester of a-phenylwpropargyloxyphenylacetic acid, a crystalline substance having a melting point of 5960C after being recrystallized from methanol.

Elementary analysis:

C H Calculated for C H O, 77.14 5.71 Found 77.31 5.65

EXAMPLE 5 4.3 g of propargyl bromide was added to a mixture of 4.5 g of potassium carbonate and 6.4 g of diphenylacetic acid in 50 cc of acetone, the resultant mixture was refluxed for 1 hour. Precipitates were filtered off from the cooled reaction mixture, and the acetone was removed from the filtrate by distillation. The residual oil was dissolved in ether and washed with water. The ether solution was dried over anhydrous magnesium sulfate, and the ether was removed by distillation to give 6.9 g of propargyl ester of diphenylacetic acid, an oily substance having a refractive index of n 1.5676 after being purified by alumina column chromatography.

Elementary analysis:

Calculated for C H O Found EXAMPLE 6 2.7 g of propargyl bromide was added to a solution of 4.5 g of a-p-tolylphenylacetic acid and 2.2 g of tri-' C H Calculated for C H O 81.82 6.06 Found 82.06 6.13

EXAMPLE 7 4.8 g of 1,1-diphenyl-l-hydroxy-pentane dissolved in 10 cc of anhydrous dimethylformamide was added to a mixture of 720 mg of sodium hydride-paraffin (68 percent) and 20 cc of anhydrous dimethylformamide.

The resultant mixture was reacted with 2.7 g of propargyl bromide in a manner similar to that in Example 1 to give 3.5 g of l,1-dipheny1-lapropargyloxy-pentane, an oily substance having a refractive index n 1.5742 after being purified by alumina column chromatogra- Elementary analysis:

C H Calculated for C H O 86.33 7.91 Found 86.46 8.03

EXAMPLE 8 A solution of 2.3 g of diphenylmethanol in 10 cc of anhydrous dimethylformamide was added to a mixture of 650 mg of sodium hydride-paraffin (50 percent) and 20 cc of anhydrous dimethylformamide. The resultant mixture was reacted with 1.5 g of propargyl bromide in a manner similar to that in Example 1 to give 1.8 g of diphenylmethyl propargyl ether, an oily substance having a refractive index of u 1.5791 after beingpurified by alumina column chromatography.

Elementary analysis:

C H Calculated for C H O 86.49 6.31 Found 86.61 6.24

EXAMPLE 9 C H Calculated for C H O 86.46 6.78 Found 86.38 6.51

EXAMPLE 10 1.4 g of propargyl bromide was added to a solution of 2.4 g of a-phenyl-a-methoxy-phenylacetic acid and 1.1 g of triethylamine in 20 cc of dimethylformamide. The reaction was carried out in a manner similar to that in Example 3 to give 2.5 g of propargyl ester of a-phenyl-a-methoxy-phenyl-acetic acid, a crystalline substance having a melting point of 56-59C after being recrystallized from ethanol.

Elementary analysis:

H Calculated for CHHWQ, 77.14 5.71 Found 77.25 5.83

EXAMPLE 11 A solution of 1,l-diphenylethane-l,2-diol in cc of anhydrous dimethylformamide was added to a mixture of 720 mg of sodium hydride-paraffin (68 percent) and cc of anhydrous dimethylformamide. The resultant mixture was reacted with 2.5 g of propargyl bromide in a manner similar to that in Example 1 to give 1.7 g of 1 l-diphenyl-l ,2-dipropargyloxy-ethane, a crystalline substance having a melting point of 48.549.5C after being recrystallized from ethanol.

Elementary analysis:

C H Calculated for C H O, 82.76 5.92 Found 82.61 5.78

EXAMAPLE 12' A solution of 4.8 g of 2,2-diphenyl-3-hydroxypro- -pionic acid in 10 cc of anhydrous dimethylformamide was added to a mixture of 1.5 "g of sodium hydrideparaffin (68 percent) and 30 cc of anhydrous dimethylformamide. The resultant mixture was reacted with 5.0 g of propargyl bromide in a manner similar to that in Example 1 to give 4.0 g of propargyl ester of 2,2- diphenyl-3-propargyloxypropionic acid, an oily substance having a refractive index of n 1.5695, after being purified by alumina column chromatography.

Elementary analysis:

Calculated for C H O; 79.25 5.66 Found 79.38 5.55

EXAMPLE 13 2.4 g of propargyl bromide was added to a solution 7 of 2.3 g of diphenylmalonic acid and 1.0 g of triethylamine in 20 cc of dimethylformamide. The reaction was carried out in a manner similar to that in Example 3 to give 2.5 g of propargyl ester of diphenylmalonic acid, an oily substance having a refractive index of n 1.5663.

Elementary analysis:

C H Calculated for C H O 75.90 4.82 Found 74.98 5.42

EXAMPLE 14 A solution of 2,2-diphenyl-1,3-dihydroxypropane in 10 cc of anhydrous dimethylformamide was added to a mixture of 1.5 g of sodium hydride-paraffin (68 percent) and 20 cc of anhydrous dimethylformamide. The resultant mixture was reacted with 5.2 g of propargyl bromide in manner similar to that in Example 1 to give 4.7 g of 2,2-diphenyl-1,3-dipropargyloxy-propane, an oily substance having a refractive index of n 1.5672.

Elementary analysis:

C Calculated for C H O 82.89 6.58 Found 82.30 6.41

EXAMPLE 15 1.4 g of allyl bromide was added to a solution of 2.4 g of a-phenyl-a-methoxy-phenylacetic acid and 1.1 g of triethylamine in 20 cc of dimethylformamide. The reaction was carried out in a manner similar to that in Example 3 to give 2.6 g of allyl ester of a a-phenyl-a'- methoxy-phenylacetic acid, an oily'substance having a refractive index of n 1.5537. 1

Elementary analysis:

C H Calculated for C H 0, 76.60 6.38 Found 76.43 6.52

EXAMPLE 16 A solution of 2,2-dipheny1-2-methoxy-l-hydroxyethane in 10 cc of anhydrous dimethylformamide was added to a mixture of 1.2 g of sodium hydride-paraffin (68 percent) and 20 cc of anhydrous dimethylformamide. The resultant mixture was reacted with 3.9 g of propargyl bromide in manner similar to that in Example 1 to give 6.8. g of 2,2-diphenyl-2-methoxy-1- propargyloxy-ethane, an oily substance having a refractive index of n,, 1.5681.

Elementary analysis:

C H Calculated for C H O 81.20 6.77 Found 80.97 6.63

EXAMPLE 17 C H Calculated for C H O, 80.60 7.46 Found 0.83 7.12

EXAMPLE 18 A solution of 6.5 g of ethyl a-(p-chlorophenyD-ahydroxy-p-chlorophenylacetate in cc of anhydrous dimethylformamide was added to a mixture of 0.7 g of 68 percent sodium hydride-paraffin and 20 cc of anhydrous dimethylformamide.

The mixture was reacted with 3.0 g of propargyl bro mide in manner similar to that in Example 1 to give 5.2 g of ethyl a-(p-chlorophenyl)-a-propargyloxy-pchlorophen'yl-acetate, n 1.5651. I

Elementary analysis: 1

Calculated for c,.11,.,o,c1, 62.81 4.41 19.56

Found 62.56 4.18 19.81

EXAMPLE 19 A solution of 6.0 g of o-(p-chlorophenyl)-a-hydroxyp-chlorophenylacetic acid in 10 cc of anhydrous dimethylformamide was added to a mixtureof 1.5 g of 68 percent sodium hydride-paraffin and 20 cc of anhydrous dimethylformamide. The mixture was reacted with 6.0 g of propargyl bromide in manner similar to that in Example 1 to give 4.8 g of propargyl a-(pchlorophenyl)-a-propargyloxy-p-chlorophenylacetate, n 1.5735.

Elementary analysis:

Calculated for C H O Cl, 64.34 3.75 19.03

Found 64.18 3.56 19.43

EXAMPLE 20 a solution of 5.2 g of a-phenyl-a-methoxyphenylacetic acid chloride in cc of dry benzene was added to a solution of 1.2 g of propargyl alcohol in 2.4 g of pyridine and cc of dry benzene was sufficiently mixed and allowed to stand over night at room temperature.

Thereafter, the reaction mixture was washed with 5 percent aqueous hydrochloric acid, 5 percent aqueous sodium carbonate and saturated sodium chloride solution in order and evaporation of the solvents employed gave 5.1 g of pale yellow crystals.

This crystals were recrystalized from ethanol to give white crystals having m.p. 56-59C.

Elementary analysis:

C H Calculated for C H O 77.14 5.71 Found 7.21 5.

EXAMPLE 21 A solution "of 5.2 g of a-phenyl-a-methoxyphenylacetic acid chloride in 15 cc of dry benzene was added to a solution of 1.2 g of propargyl alcohol and 2.4. g of dry piridine in 2.4 g of dry benzene.

The mixture was sufficiently mixed and allowed to stand over night.

Thereafter, the reaction mixture was treated in manner similar to that in Example 20 to give 5.2 g of allyl a-phenyl-a-methoxyphenylacetate, n 1.5532.

' Elementary analysis:

C H Calculated for C H O 76.60 6.38 Found 76.49 6.48

EXAMPLE 22 A mixture of 5.0 g of a-phenyl-a-methoxyphenyl acetic acid, 1.2 g of allyl alcohol and 0.2 g of p-toluenesulfonic acid was added to cc of benzene.

The mixture was heated under reflux for 8 hours in an apparatus equipped with a rectification towerto separate water removed. After cooling, the reaction mixture was washed with 5 percent aqueous sodium carbonate solution and saturated sodium chloride solution in order and dried over anhydrous magnesium sulfate.

Evaporation of the solvent employed gave 4.0 g of allyl a-phenyl-a-methoxyphenylacetate, n 1.5530.

Elementary analysis:

c H Calculated for C H O 76.60 6.38 Found 76.41 6.43

EXAMPLE 23 A mixture of 4.7 g of a-phenyl-a-methoxyphenyl acetic acid anhydride and 1.2 g of allyl alcohol was added to 50 cc of benzene and the mixture was heated for 4 hours under reflux.

After cooling, the reaction mixture was washed with 5 percent aqueous sodium carbonate solution and saturated sodium chloride solution in order, and dried over anhydrous magnesium sulfate.

Evaporation of the solvent employed gave 4.5 g of allyl a-phenyl-a-methoxyphenylacetate, 11,, 1.5533.

Elementary analysis:

' C H Calculated for C H O, 76.60 6.38 Found 7 76.37 6.21

EXAMPLE 24 A solution of 6.6 gof propargyl a-phenylabromophenylacetate in 20 cc of ethanol was added to a solution of 1.1 g of sodium methylate in 30 cc of methanol.

The mixture was heated for 2 hours under reflux, thereafter cooled, poured onto water and extracted with ether.

The ether layer was washed with percent aqueous hydrochloric acid solution, 5 percent aqueous sodium carbonate and saturated sodium chloride solution in order and dried over anhydrous magnesium sulfate.

Evaporation of ether gave 5.2 g of propargyl a-phenyl-a-methoxyphenylacetate as pale yellow crystals, which were recrystallized from ethanol to give white crystals, m.p. 56-59C.

Elementary analysis:

C l-l Calculated for C H O 77.14 5.71 Found 77.20 5.78

- EXAMPLE 25' A mixture of 4.6 g of benzilic acid, 2.2 g of triethylamine and 30 cc of dimethylformamide was added with 2.4 g of propargyl bromide.

The mixture was treated in same way as in Example 3 to give 4.5 of propargyl benzilate, n 1.5704.

Elementary analysis:

. C l-l Calculated forC H O, 76.69 5.26 Found 76.52 5.39

EXAMPLE 26 A solution of 1.2 g of propargyl alcohol, 2.4 g of dry pyridine in 20 cc of dry benzene was added with a solution of 7.1 g of a-phenyl-a-bromophenyl acetic acid bromide in cc of dry benzene.

The mixture was sufficiently mixed and allowed to stand overnight. Y

The reaction mixture was treated in same way as in Example to give 5.2 g of propargyl a-phenyl-abromophenylacetate. The white crystals recrystallized from benzene showed m.p. 68-70C.

Elementary analysis:

' c H Br Calculated for C,-,H,,Br0, 62.01 3.95 24.32 Found 62.13 3.86 24.11

EXAMPLE 27 r The white crystals recrystallized from benzene showed m.p. 68-70C.

Elementary analysis:

1 C H Br Calculated for C H BrO, 62.01 3.95 24.32

Found 6222 3.83 24.16

EXAMPLE 28 C H C1 Calculated forC H Clo 69.10 4.99, 13.63 69.43 4.65 13.92

Found It has hitherto been known that sesamin and related compounds contained in the sesame oil have enhancing action on the potency of an insecticide of the pyrethoid type. These compounds have little insecticidal activity when used alone, but it has been recognized that they can markedly enhance the effectiveness of an insecticide of the pyrethroid type when admixed with the latter in a suitable proportion. This enhancing action is generally called a synergetic effect, and the agent which exerts said effect is calleda synergist.

Since sesamin and related compounds have a methylenedioxy-phenyl group in their molecule, various compounds which have said group in the molecule were synthesized. As the synergist for pyrethrins, there are now widely used a-[2-(2-butoxyethoxy)ethoxy]-4,5- methylenedioxy-2-propyltoluene (hereinafter referred to as piperonyl butoxide), 1,2-methylenedioxy-4-[2- (octylsulfinyl)propyl]berizene (hereinafter referred to as sulfoxide), 4-(3,4-methylenedioxy-phenyl)-5-methyl-l,3-dioxane (hereinafter referred to as safroxane), etc. There are other kinds of synergist on the market including N-( 2-ethylhexyl)-bicyclo-[2,2,l ]-hept-5-ene-,

anhydrophthalic acid-2,3-dicarboxyimide (trade-name: MGK-264, McLaughlin Gormley King Co.), etc. The most widely used piperonyl butoxide shows a remarkable synergetic effect upon natural pyrethrins, whilst the effect upon allethrin is somewhat inferior. MGK-264 behaves in the way opposite to piperonyl butoxide. Thus every. known synergist has both advantage and disadvantage.

However, according to the present invention, the diphenylmethane derivatives first synthesized by the present inventors have remarkable synergetic effect upon natural pyrethrins as well as upon allethrin, said effect upon allethrin being superior to that of piperonyl butoxide. Also, the present compounds have a remarkable synergetic effect upon other member of insecticides of the cyclopropanecarboxylic ester type, including the one formerly invented by the presentinventors. Moreover, the present compounds show a remarkable synergetic effect upon an insecticide of the carbamate type such as l-naphthyl N-methylcarbamate (hereinafter referred to carbaryl), as is the case usually with other known synergists for insecticides of the pyrethroid type, for example, piperonyl butoxide.

Following experiment illustrates the effectiveness of the present compounds as the synergists for insecticides of the cyclopropanecarboxylic acid ester and carbamate types.

EXPERIMENT Biological test solutions in acetone were prepared from natural pyrethrins, allethrin, N-

(chrysanthemoxymethyl)-3,4,5,6-tetrahydrophthalimide (hereinafter referred to as phthalthrin) and carbaryl, each alone or each with the addition of five times each weight of piperonyl butoxide or of the compounds from No. 1 to No. 15. The insecticidal activity was tested by dropping a minute amount of the test solution from a microsyringe onto the notum of a housefly (Musca domestica). The 50 percent lethal doses (LD after 24 hours were as shown in the following table.

Table of insecticidal activities Relative enhancelnsecticide Synergist LD ment of (1/F1y) 1 insecticidal activity Phthalthnn 0.49 1.0 do. Piperonyl butoxide 0.1 15 4.3 do. om- (1) 0.038 13.2

pound do. do. (2) 0.065 7.5 do. do. (3) 0.09 5.5 do. do. (4) 0.10 4.9 do. do. (5) 0.10 4.9 do. do. (6) 0.11 4.5 do. do. (7) 0.095 5.2 do. do. (8) 0.06 8.2 do. do. (9) 0.05 i 9.8 do. do. (10) 0.030 16.3 do. do. (11) 0.034 14.4 do. do. (12) 0.044 11.1 do. do. (13) 0.104 4.7 do. do. (14) 0.042 11.7 do. do. (15) 0.091 5.4 Natural pyrethrms 0.35 1.0 do. Piperonyl butoxide 0.07 5.0 do. Com- (1) 0.06 5.8

pound do. do. (2) 0.08 4.4 do. do. (9) 0.05 7.0 do. do. (10) 0.043 8.1 Allethrin 0.54 1.0 do. Piperonyl butoxide 0.17 3.2 do. Com- (1) 0.065 8.3

pound do. do. (6) 0.11 4.9 do. do. (7) 0.12 4.5 do. do. (8) 0.09 6.0 do. do. (10) 0.061 8.9 Carbaryl 5 1.0 do. Pi eronyl butoxide 0.21 23.8 do. om- (1) 0.14 32.1

pound do. do. (8) 0.17 29.4 do. do. (10) 0.10 50 do. do. (13) 0.20 25 Com- (1) 2 pound do. (2) 2- do. (3) 2 do. (4) 2 do. (5) 2 do. (6) 2 do. (7) 2 do. (8) 2 do. '(9) 2 do. 10) 2 do. (1 1) 2 Com- (12) 2 pound do. (13) 2 do. (14) 2 Table of insecticidal activities-Continued Relative enhancelnsecticide Synergist LD ment of (r/Fly) insecticidal activity tetramethylcyclopropane-l-carboxylate; N- (chrysanthemoxymethyl)-phthalimide; N- (chrysanthemoxymethyl)-monothiophthalimide; N- (chrysanthemoxymethyl)-dimethylmaleimide; 6-

chrysanthemoxymethyltetralin; 3-allyl-2'-methyl-4'- Oxo-2-cyclopentenyl-2,2,3,3- tetramethylcyclopropane- 1 -carboxylate; 5-benzyl-3- furylmethylchrysanthemate [hereinafter referred to as Chrysron (registered trademark, Sumitomo Chemical Co., Ltd.)]; -5-benzy1-3'-furylmethyl-2,2,3,3,- tetramethylcyclopropane-l-carboxylate and other substituted furfuryl esters of cyclopropanecarboxylicacid; 5 '-benzyl-2 -thenyl-2,2,3 ,3 -tetramethylcyclopropanel-carboxylate; 5-benzyl-2-thenylchrysanthen1ate; di-

methrin; 3-phenoxybenzylchrysanthemate; 3 phenoxybenzyl-2,2,3,3-tetramethylcyclopropane-1- carboxylate; 3-benzy1benzylchrysanthemate; 3

benzylbenzyl 2,2,3,3-tetrarnethylcyclopropane-1- carboxylate and other substituted benzyl ester of cyclopropanecarboxylic acid; carbaryl; 3,4-dimethylphenyl- N-methylcarbamate [hereinafter referred to as ,Meobal (registered trademark, Sumitomo Chemical Company, Ltd. 3 ,5-dimethylphenyl-N-methylcarbamate (hereinafter referred to as Cosban); Z-sec-butylphenyl- N-methylcarbamate (hereinafter referred to as Bassa).

Compositions comprising one or more insecticides of the cyclopropanecarboxylic ester type and the carbamate type, as the active ingredients, and, in addition, one or more diphenylmethane derivatives of the present invention in an amount of 0.5 to 50 times the weight of said active ingredients, are specifically effective in controlling sanitary pests such as house-flies, mosquitoes, cockroaches; rice plant pests such as rice stem borers, planthoppers, leafhoppers; lepidopterous larvae, which are injurious to fruit-trees and vegetables, such as larvae of cabbage worms, armyworms, diamond-back moths, cutworms, etc.; plant parasitic mites; pantry pests such as rice weevils, almond moths, etc. Furthermore, said compositions are also effective in controlling other agricultural and sanitary pests, forest pests, and pests for horticulture.

In preparing the insecticidal compositions according to the present invention, the active insecticides of the cyclopropanecarboxylic ester type or the carbamate type, and the novel synergists of diphenylmethane derivatives are directly formulated by use of usual adjuvants for insecticides into all forms, such as oil sprays, emulsifiable concentrates, wettable powders, dusts, granules, aerosols, mosquito coil, fumigants, dusts containing baits and other attractants, solid preparations, and any other form, although in some cases it is more convenient for formulation to use the active ingredients and synergists dissolved in advance in suitable solvents I such as xylene, methylnaphthalene, acetone, trichloro- The preparative method and the effectiveness of the present insecticidal compositions will be further illustrated in the following Examples 29 to 51, and Test Examples l to 10, these examples being, needless to say, not intended to limit the scope of the present invention.

In the examples, the numerals in the parentheses show the aforementioned numbers representing the present compounds, and-all parts are by weight.

EXAMPLE 29 A mixture of 0.05 part of phthalthrin and 0.25 part of any one of the compounds (1), (2), (3), (8), (9), (l) and (l l) was dissolved in 2 parts of xylene, and was made up to 100 parts by the addition of deordorized kerosene to obtain each oil spray.

EXAMPLE 30 A mixture of 0.] part of N-(chrysanthemoxymethyl) dimethylmaleimide, 0.3 part of the compound (4) and 0.2 part of piperonyl butoxide was dissolved in 5 parts of xylene, and was made up to 100 parts by the addition of deodorized kerosene to obtain an' oil spray.

EXAMPLE 31 A mixture of 0.l part of allethrin and 0.5 part of any one of the compounds (1), (2), (5), (6) and was dissolved in 2 parts of xylene and was made up to 100 parts by the addition of deodorized kerosene to obtain each oil spray.

EXAMPLE 32 A mixture of 0.05 part of Chrysron and 0.25 part of any one of the compounds (1), (2), (7), (8), (9), (l0), (1 l) and (13) was dissolved in 2 parts of xylene, and

.was made up to 100 parts by the addition of deodorized kerosene to obtain each oil spray.

EXAMPLE 33 A mixture of 0.035 part of phthalthrin, 0.015 part of Chrysron and 0.15 part of the compound 1) was dissolved in 2 parts of xylene and was made up to 100 parts by the addition of deodorized kerosene to obtain an oil spray.

aerosol preparation.

EXAMPLE 34 1.5 parts of a pyrethrum extract (containing 20 percent of pyrethrins), 1.5 parts of the compound (1), 1 part of DDT, 5 parts of xylene, and 6 parts of deodorized kerosene were mixed together and charged in an aerosol container with removed valve. After being fitted with the valve, the container was charged through the valve with 85 parts of a propellant (liquefied petroleum gas) under pressure to obtain an aerosol preparatron.

EXAMPLE 35 0.35 part of phthalthrin, 0.05 part of Chrysron, 1 part of the compound (2), 6.6 parts of xylene, and 7 parts of deodorized kerosene were mixed together and charged in an aerosol container with removed valve. After being fitted with the valve, the container was charged through the valve with 85 parts of a propellant (liquefied petroleum gas) under pressure to obtain an EXAMPLE 36 12.5 parts of deodorized kerosene and 1 part of an emulsifier Atmos-300 (registered trademark, Atlas Chemical Industries, Inc.) were added to a mixture of 0.3 part of phthalthrin, 0.2 part of 3-phenoxybenzyl chrysanthemate, 0.5 part of piperonyl butoxide, and 0.5 part of the compound (1), and the whole mixture was emulsified in parts of purified water. The resultant emulsion was charged in a aerosol container together with 35 parts of a mixture (3:1) of deodorized butane and deodorized propane to obtain a waterbased aerosol.

EXAMPLE 3 A solution of 0.3 part of phthalthrin and 1.5 parts of any one of the compounds (1), (2), (8), (l0), (l2), (l4) and l5 in 20 parts of acetone was added to 98.2

, parts of a diatomaceous earth (300 mesh), and thoroughly mixed by grinding in a mortar. Thereafter, the acetone was removed by evaporation to give a dust preparation.

EXAMPLE 38 i A mixture of 1 part of Meobal and 3 parts of any one of the compounds (1), (3), (6), (7) and (10) was dissolved in 20 parts of acetone. Each solution was added with 96 parts of talc (200 mesh) and thoroughly mixed by grinding in a mortar. Thereafter, the acetone was removed by evaporation to give each dust preparation.

EXAMPLE 39 A mixture of 1 part of Bassa and 2 parts of each of the compounds (8), (9), (11) and (14) was dissolved in 20 parts of acetone. Each solution was added with 97 parts of talc (200 mesh) and thoroughly mixed by grinding in a mortar. Thereafter, theacetone was removed by evaporation to give each dust preparation.

EXAMPLE 40 5 parts of phthalthrin, 20 parts of the compound l 15 parts of Sorpol SM-200 (registered trademark for an emulsifier produced by Toho Chemical Co.), and 60 parts of xylene were mixed together by thorough stirring to give an emulsifiable concentrate.

EXAMPLE 41 parts of allethrin, 25 parts of the compound (4), parts of Sorpol SM-200, and 55 parts of xylene were mixed together by thorough stirring to give an emulsifiable concentrate.

EXAMPLE 42 5 parts of Chrysron, 25 parts of the compound (2), 15 parts of Sorpol SM-200, and 55 parts of xylene were mixed together with stirring to give an emulsifiable.

concentrate.

EXAMPLE 43 15 parts of phthalthrin, 5 parts of Chrysron, 30 parts of the compound (6), and 5 parts of Sorpol SM-200 were well mixed together and were added with 45 parts of talc (300 mesh). The whole mixture was ground thoroughly in a mortar to give a wettable powder.

EXAMPLE 44 EXAMPLE 45 A solution of 0.2 g. of Chrysron and 0.8 g. of the compound (1) in appropriate quantity of chloroform was adsorbed uniformly on the surface of an asbestos sheet, 2.5 cm. X 1.5 cm. in size and 0.3 mm. in thickness, and covered with an asbestos sheet of the same size to give a fumigatory insecticidal composition on fibrous supports for use on an electrically heated plate. As the fibrous supports, may be used other equivalent materials such as a pulp sheet.

EXAMPLE 46 15 parts of 3'-phenoxybenzyl-2,2,3,3-tetramethylcyclopropane-l-carboxylate, 35 parts of the compound (2), and 5 parts of Sorpol SM-200 were well mixed together, and 45 parts of talc (300 mesh) were added to the mixture. The whole mixture was ground thoroughly in a mortar to give a wettable powder.

EXAMPLE 47 5 parts of 6-chrysanthemoxymethyl-tetralin, 15 parts of the compound (5), 2 parts of 0,0-dimethyl-0-(3- methyl-4-nitrophenyl) thiophosphate, 10 parts of Sorpol SM-200, and 68 parts of xylene were thoroughly mixed with stirring to give an emulsifiable concentrate.

EXAMPLE 48 tar, the ground mass was granulated by means of a granulator, and dried in a current of air to give a granular composition.

EXAMPLE 49 0.4 part of phthalthrin, 2 parts of the compound (10), 6 parts of xylene and 6.6 parts of deodorized kerosene were mixed and the mixture was treated according to the same way as in Example 17, to obtain aerosol.

EXAMPLE 50 0.3 part of phthalthrin, 0.05 part of Chrysron, 0.7 part of the compound (10), 6 parts of xylene and 7.95 parts of deodorized kerosene were mixed and the mixture was treated according to the same way as in Example 17, to obtain aerosol.

EXAMPLE 51 5 parts of phthalthrin, 20 parts of the compound (l0), 15 parts of Sorpol SM-200 and 60 parts of xylene were mixed and the mixture was treated according to the same way as in Example 23, to obtain emulsifiable concentrates.

The insecticidal activities of the compositions of the present invention, which were prepared as described in the above examples, were as shown in the following Test Examples.

TEST EXAMPLE 1 The insecticidal activities of the oil spray preparations obtained in Example 29 to 33 were tested against house fly adults by Campbels turn-table method [Soap and Sanitary Chemicals, Vol. 14, No. 6, p 119 (1938)]. A group of about 100 adults of house fly .(Musca domestica) was exposed to the descending spray of 5 ml. of each composition. After 10 minutes of exposure, the flies were taken out and' fed in another constant temperature room at 27C. After 24 hours, the-alive and dead were observed and the percentage mortality was calculated. The results obtained were as shown in Table 1.

Table 1 Oil spray compositions Mortality Example No. Insecticide Synergist 29 Phthalthrin 0.05 Com- (1) 0.25 99 poun do. do. do. (2) do. 95 do. do. do. (3) do. do. do. do. (8) do. 92 do. do. do. (9) do. 95 do. do. do. (10) do. do. do. do. (11) do. 100

Mixture of: N-(chrysanthemoxy- 30 methyl) dimethyl- Com- (4) 0.3 92

pound maleimide 0.1 Piperonyl butoxid 0.2 31 Allethrin 0.1 Com- (1) 0.5 98

pound do. do. do. (2) do. 95 do. do. do. (5) do. 90 do. do. do. (6) do. 92 do. do. do. (10) do. 100 32 Chrythron 0.05 Com (1) 0.25 100 pound do. do. do. (2) do. 100 do. do. do. (7) do. 98 do. do. do. (8) do. 100

Table l-Continued TEST EXAMPLE 2 for testing aerosols [Soap and Chemical Specialities, 20

Blue Book (1965)]. The results obtained were as shown in Table 2.

of a dust preparation obtained in Examples 21 to 23. After 4 minutes of exposure, the pot was entirely enclosed in wire gauze. More than 90 percent of 20 adults M l spray composmonst tali t y of brown planthopper (Nllaparvata lugens), which had Example q S 7) 5 been released into said enclosure, were found dead No. Insecticide a) ynergls after 24 ho do. do. do. 9 do. 100

do. do. do. 10) do 100 do. do. do. (11) do 100 do. do. do. 13 do 100 Mixture of TEST EXAMPLE 33 Phthalthrin 0.035 Com- (1) 0.15 98 pound Chrysron 0.015 Allethrin 0.2 81

About adults of house fly (Musca domestica), which had been released into a glass chamber of cm) in volume, were sprayed with 0.7 ml. of an emulsion prepared by diluting an emulsifiable concentrate obtained in Examples 40 to 42 and 51, with water to 1/50 concentration, by means of a glass atomizer under a pressure of 20 lbs. In 10 minutes, more than percent of the flies were knocked down, and more than 90 percent of the flies knocked down were found dead on the following day.

TEXT EXAMPLE 3 Dust preparations obtained in Examples 37 and .38 were applied uniformly on the bottom surface of the deep Petri dishes at a rate of 2 g/m The inner surface of the wall except for 1cm. from the bottom was coated with butter. A'group of 10 adults of German cockroach (Blattella germanica) was released into each dish to be contacted with the insecticide for 10 minutes, and the percentage Knockdown was observed. Then the cockroaches were transferred into insecticide-free containers and fed for 3 days to observe, thereafter, the alive 3nd dead. The results obtained were as shown in Table TEST EXAMPLE 6 Rice plants, which had been cultivated for 45 days 40 after sowing in Wagner pots (1/50,000), were sprayed with a diluted emulsion (diluted with 200 times water) of theemulsifiable concentrates obtained in Example 42, or with a solution (in 500 times water) of any one of .the wettable powders obtained in Examples 43 and 5 46, at a rate of 10ml. per pot. Then each pot was en- Table 3 Dust compositions Fall- Example down Mortal- No. 10 min. it

Insecticide Synergist (92 37 Phthalthrin 0.3 Com- (1) 1.5 100 100 pound do do. do. (2) do. 100 95 do do. do. (8) do. 100 do do. do. (10) do. 100 100 do do. do. (12) do. 100 98 do do. do. (14) do. 100 92 do. do. do. (15) do. 100 90 38 Meobal 1.0 Com- (1) 3.0 85 100 poun do. do. do. do. 100

- TEST EXAMPLE 7 In a glass chamber (70cm. X 70 cm. X 70 cm.), 50 adults of northern house mosquito (Culex pipiens pallens) were exposed to the fumes generated by any one TEST EXAMPLE 4 About 20 rice seedlings, cultivated for 20 days after sowing in a flower pot of 8.5 cm. in diameter, were dusted by means of a bell jar duster with 300 mg./pot

of the coils obtained in Example 44, which had been ignited at both ends. In every case, more than 80 percent of the mosquitoes were knocked down in 20 minutes.

TEST EXAMPLE 8 In a glass chamber (70 cm. X 70 cm. X 70 cm.), 50 adult houses flies were exposed to the fumes generated by the fumigatory insecticidal composition obtained in Example 45, which had been placed on an electrically heated plate. In 20 minutes, more than 80 percent of the flies were knocked down.

TEST EXAMPLE 9 2 Litres of a diluted emulsion (diluted with 40,000 times water) of any one of the emulsifiable concentrates obtained in Examples 41 and 47 were placed in a polystyrene container (23 cm. X 30 cm. and 6 cm. in depth), into which 100 full grown larvae of northern house mosquito were released. On the following day, more than 90 percent of the larvae were found dead.

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Q crnooinozon o ocr-nozcn 4. A compound represented by the formula,

II C- Q CHzO CH2 CECH 5. A compound represented by the formula,

Q oinoornozoir Q cmoomozoir 

1. A COMPOUND REPRESENTED BY THE FORMULA,
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